The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 20, 1990
Filed:
Mar. 29, 1989
Applicant:
Inventors:
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Primary Examiner:
Int. Cl.
CPC ...
G03C / ; G03F / ;
U.S. Cl.
CPC ...
430165 ; 430191 ; 430192 ; 430193 ; 430326 ; 430330 ;
Abstract
A positive-working photosensitive mixture is disclosed, which comprises an o-quinonediazide as the photosensitive compound and a novolak resin, which is insoluble in water and soluble in aqueous-alkaline media, as a binder, said novolak resin being prepared by condensation of a mixture comprising m-cresol and 2,3,6-trialkylphenol with a carbonyl component, preferably in a solvent. The photosensitive mixture containing the above-described binder is distinguished by high thermal stability and by a low dark erosion rate when developed with a metal ion-free developer.